Tungsten-tin-molybdenum mineralization in the Karkonosze massif

Abstract

Ore mineralization in the zone of aplogranites in the NW part of the Karkonosze massif (Sudetes Mts), partly metasomatized by Na-bearing solutions, and in quartz veins, reveal a lengthly list of minerals, such as wolframite, cassiterite, molybdenite, scheelite, native bismuth, bismuthite and bismuth sulfosalt. Studies of fluid inclusions reveal the crystallization conditions as: pressure about 700 atm, temperature 405-375°C in the pneumatolytic stage and, after condensation, from 375°C down to about 100°C (hydrothermal stage). The mineral assemblage, as well the sequence and conditions of crystallization are typical of the majority of W-Sn-Mo deposits.